solventwelded

Solvent-welded is the term used to describe a joint that has been formed by solvent welding, a method in which a solvent-based cement is applied to thermoplastic pipe and fittings to soften the surfaces. When the parts are pressed together, the softened plastic fuses with the surrounding material, creating a permanent, pressure-tight bond. The result is a joint that is effectively as strong as the pipe itself.

The process typically uses PVC, CPVC, or ABS piping and fittings. A primer may be used to clean and soften the surfaces, followed by applying a solvent cement to the pipe end and the fitting socket. The pipe is then inserted with a slight twist to distribute the cement evenly and held in place until the joint begins to set. Curing times depend on the cement type, temperature, and pipe size, and excess cement should be wiped away promptly.

Solvent-welded joints are common in drainage, vent, irrigation, and many potable water systems, especially where non-metallic piping is used. They are favored for their speed, reliability, and relatively low cost, and they can be highly durable when properly installed. However, they are generally permanent and require precise alignment and clean, dry surfaces. They are not ideal in systems that experience significant movement or vibration, and improper use can weaken the joint or cause solvent fumes to vent.

Safety and standards emphasize adequate ventilation and protective equipment due to solvent fumes, and following local plumbing codes and manufacturer instructions. Proper surface preparation and material compatibility are essential for a durable solvent-welded joint.